Machine for sharpening cutting-tools of cutters.



No. 63|,aa4- Patented Aug. 29, |999. E. A. wAHLsTnM. MACHINE FOR SHARPENING CUTTING TOOLS 0F GUTTERS.

(Application filed Mar. 8, 1899.)

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Nu. 631,884. Patented Aug. 29, |899. E. A. wAHLsTRDM. MACHINE FOB SHARPENING CUTTING TOOLS 0F C UTTERS.

(Application led. Har. 8, 1899.)

UNITED STATES EMIL ALFRED VAIILSTRM,

PATENT Prion.

OF CANNSTADT, GERM ANY.

lsrnclrroAcroiv forming part of Letters Patent No. 631,884, dated August 29, 1899.

Application sied March s, i899.

To @ZZ whom, t may concern:

vtaken out separately and sharpened.

Be it known that I, EMIL ALFRED WAHL- STRM, a subject of the King of 'l/Viirtemberg, and a resident of Cannstadt, in the Kingdom of Viirtemberg, German Empire, have invented anew and usefulMachine forSharpen'- ing the Cutting-Tools of Cutters, (for which application for patent has been filed in Germany on the 20th of August, 1898,) of which the following is an exact specification.

lVhen working with cutting-tools fixed in cutters, a great inconvenience has been found in the fact that the blunt tools couldr not be sharpened again without being taken out of the cutters. Therefore the tools had to be This process was not practicable, because in reestablishing the cutting-tools in the cutter it never was possible to place them again accurately enough as to obtain a uniform working of all theknives. A consequence of this fact was that the working surface of the cutter was not uniform and that `never an exact work could be obtained. If, however', this method was employed and the cutting-tools replaced with certain exactitude, it needed so much time that under circumstances a new tool could have been made during the time on another machine. These circumstances proved so much more inconvenient as a more Y correct and rapid Working than with a cutter in which the cutting-tools are adjusted in a precise manner is not possible. By means of my arrangement the cutting-tools can be sharpened without taking them out of the cutters. The latter may remain in the working machine and my sharpening device may be attached in suitable manner to the frame of theworking machine, or the Whole cutter is introduced into a sharpening-machine ofv particular kind. The latter is the case in the construction represented in the annexed drawings.

A characteristic feature of my invention is that I sharpen the cutting-tools with the surface of a rotating sharpening-disk which besides a rotating movement can eect an oscillating movement around an axis from which the sharpening-surface of the disk can be moved to and fro the cutting-tools to be sharpened. In sharpening with the surface of the disk a straight surface is formed on the vsemi No. 708,2t2. (No model.)

cutting-tool, while a round surface can be ing motion. The diameter of the sharpened round surface of a cutting-tool depends from the position of the surface of the sharpeningvdisk to the axisof oscillation. In my machine I arrange the sharpening-disk in such a way that it can be moved parallel to its working or sharpening surface-t'. e., transversely to the axis of rotation. This preferably is done during the sharpening process.

not only remains uniform, but also a uniform sharpening of the cutting-tools is assured.

My invention will be better understood with reference to the annexed drawings, in which similar letters'denote similar parts throughout the derent views, and in which- Figure 1 shows a side View of my sharpening device; Fig. 2, an elevational view of the same; Fig. 3 a plan View, and Fig. 4 a perspective View, of a sharpened cutting-tool. Fig. 5 is an elevational view of the whole machine; Fig. 6, a plan of the whole machine, and Fig. 7 a plan of the driving mechanism.

A cross-support B is fixed upon the support A. This cross-support B carries a device C, by means of which the cutter is kept in position.

The sharpening device proper, Figs. l to 3, is formed by a rotating sharpening-disk b, able to oscillate in its direction of axis. This disk Z5 is movable in all directions. It is attached upon an arbor w, carrying a drivingroller r9. This driving-roller runs in bearings f, supported by the arms of a fork g. The forkg is adapted to slide upon a shaft o and canbe fixed in any position by means of the vscrews s. The shaft o is provided at its free extremity with a handle p and is placed rectangularly to the main shaft h. This shaft 7L is rotatably j ournaled in the bearings 1I and can be moved along its longitudinal direction by means of a handle p'. The bearing i rotates around a vertical standard z. The latter can be raised and lowered in known manner by means of teeth z and a toothed wheel z2, Fig. 5, and fixed in any position by means of the elastic chuck z3.

It is evident that the source of power might be any one. In the example represented in the drawings an clectromotor cis used to drive Thereby is attained that the working surface sharpened when the disk is set into oscillatthe pulley r. An endless band runs from the pulley r' over the pulley r3 to the pulley r4, from there down again to the pulley T5, over the pulley r2, and back to fr'. The pulleys r2 and r3 are secured to the body of the machine in a frame q, while the pulley '1"5 is fixed to an arm q of the vertical shaft z. The pulley r4 is connected together with a smaller pulley rs and rotates around the shaft h. The movements of the pulley r1 are transmitted by the pulley'r8 and the endless belt to the guiderollers r6 and fri, and consequent ly to the roller rfsetting'in motion the sharpening-disk Z).

The actuation of my machine is as follows: After the cutter, with all itsl cutting-tools, is brought upon the carrier C the sharpening device, Figs. l to 8, is adjusted in height in such a manner that the cutting-tools can be sharpened subsequently one after the other. Therefore it is necessary that the movement of the cutter has to be arrested after one knife has been sharpened. For this purpose I have fixed to the carrier G a stop n, gripping into the holes of the cutter f, thereby preventing the further rotation of the same.

The disk b can exactly be adjusted. The

.distance between the fore edgem of the disk l) and the middle line of the shaft h'forms the radius of the circu inferences which draws the sharpening-disk, with its fore edge,.around each of the cutting-tools. To execute this circular movement, the shaft o is turned around the shaft 7L by means of the handle p. Evidently the shaft Zz forms the axis of rotation. This oscillating movement can be determined at one or at both sides by means of suitable stops. In Fig. 3 stop t bears against stop t of the bearing 'L'. A uniform wear of the disk b is attained by the longitudinaldisplacement ofthe shaft Zz.

Y In sharpening the straight surface l of the cutting-tool the sharpening-disk is moved forward and backward parallel to the shaft h 7c Z. The same is done when sharpening the round surface.

Fig. 4 illustrates a cutting-tool, and it is easy to understand that a straight surface l is sharpened when the disk ZJ does not rotate around the shaft h 7c Z, while by swinging the disk h around 7a Z the round surface 2 of the knife'will be sharpened. The angle of the straight surface l in respect to the middle line of the cutting-tool is determined by the stops t 25'; bnt'as the position of these stops can be varied at will (not represented in the drawings) it will be evident that this angle also can vary. A proper adjustment of the cutting-tool can be effected bythe cross-support B, rotatably fixed upon the main frame A.

In the construction represented in the drawings it is assumed that the cutter a. is employed with a special sharpening-machine. Evidently the cutter may remain in the working machine, and the sharpening device, as represented in Figs. l to 3, can be fixed to this machine in suitable manner.

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States isl. In amachine forsharpeningthe cuttingtools of cutters, the combination with a carrier C holding the tools, a rotatable sharpening-disk Z) carried by a fork gsliding upon a shaft o and provided with a handlep, a shaft h loosely mounted in a bearing i, rigidly connected to the shaft o and being rectangularly to the same, a standard z carrying the bearing t' for the shaft h, a handle p fixed to the shaft h for swinging around .the shafts 7L o and the sharpening-disk, a roller-gearing for rotating the sharpening-disk b, for the purpose and substantially as setforth.

2. In a machine for sharpening the cuttingtools of cutters, the combination of a rotatable sharygiening-disk b fixed upon the arms of a movable fork g, with a shaftA ZL rotatably fixed in a bearing t', a rod z supporting said bearing fi, driving-rollers effecting the rotation of the sharpening-disk and means to swing the disk b with the fork g around the axis Zr, Z of the shaft h, for the purpose and substantially as described.

3. Ina machine for sharpeningthe cuttingtools of cutters, the combination of a movable shaft h rotatably fixed in a bearing fi with a shaft o rigidly connected to the shaft Zt rectangularly to the same, a fork g, adapted to slide uponthe shaft 0,. screws s fixing the fork g to said shaft o, a shaft w rotating in bearingsf supported by the arms of the fork, a sharpening-disk fm, fixedl to the extremity of the shaft lw and means to give motion to the sharpening-disk, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

EMIL ALFRED 1WAHLSTROM. Witnesses:

WM. HAuN, Hf. VAGNER.

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